<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>4-超时与取消请求</title>
</head>

<body>
    <button>发送请求</button>
    <button>取消请求</button>
</body>
<script>
    const buttons = document.querySelectorAll('button')
    let xhr
    buttons[0].onclick = () => {
        xhr = new XMLHttpRequest()
        xhr.open('GET', 'http://localhost:8081/delay-server')

        // xhr.timeout = 2000 // ms为单位

        xhr.ontimeout = () => {
            alert('超时错误！')
        }
        xhr.onreadystatechange = () => {
            console.log(xhr.readyState, xhr.status, xhr.responseText)
            if (xhr.readyState === 4) {
                console.log('----', xhr.status, xhr.responseText)
            }
        }
        xhr.send()
    }
    buttons[1].onclick = () => {
        xhr.abort()
        console.log('中断请求')
    }


</script>

</html>